Screw-micrometer.



0. JORIOT. SCREW MIGROMETBR.

APPLICATION FILED MAY 16,' 1914v 1,108,993. Patented sepm, 1914.

3 SHEETS-SHEET 1.

THE .'u'ulillls PETERS CCL. PHOTD'LITHO.. WASHINGTON. D C.

C. JORIOT. SCREW MIGROMBTEP.. APPLIOATION FILED MAY 16, 1914.

l, 108,993. Patented Sept. 1, 1914.

3 SHEETS-SHEBT 2.

W@ @Mgg THE AORRIS PETERS CO.. PHOTO-LITHO.. WASHINGTON. D. C,

C. JORIOT.

SCREW MIGROMETER.

APPLICATION FILED MAY 1s, 1914.

1,108,993. Patented Sept. 1,1914.

3 SHEETS-SHBBT 3.

' t .cnMVILLE Jomor, or VILLEEs-nE-Lac, FRANCE.

SCREW-MIQROMETER.

Specification of Letters Patent.

Appiication filed May ie, i914. serial No. 839,070. v r

To all @07mm it may concern:

`Be 1t known that I, CAMILLE Jonio'r,

citizen of the French Republic, residing at Villers-de-Lac, in theDepartment of Doubs7 France, have invented Icertain new and use.-` fulimprovements in Screw-Micrometers,of

which thefollowing is a'speciiication'.

the improved micrometer.

This invention has for its object to provide an improved screwmicrometer. In the improved micrometer the micrometric screw is combinedwith an indicating hand adapted to be moved .over a graduated arc bymeans of a member which is mounted in a freely movable manner onthemicrometric screw but which can be' fixed thereto byl means of a setscrew in such a vmanner as to compel the hand to move withthemicrometricscrew. 4A device is'also provided by ydevice by operatingwhich the indicating hand can be actuated when it is independent of themic'ronietric screw.V "This device comprises" on either sideI of thepoppet e two 'levers r s pivoted co-axially relatively to :each other ats1V -o-n they poppet c. levers are fiXedto-each'other by V`a rod t whichconnects themv on'lyatone end ,while the other end o'feach of theselevers termi- ;nates in a beak r2582 respectively. The cenoperatingwhich the indicating hand,V when it is independent of the movement ofthe micrometric screw, can be returned into' a determined positionrelatively to its travel. The improved micrometer allows of takingmeasurements with greater' exactness and greater facility vthan can bedone with existing micrometers; moreover it may be used with advantageas a limit gage.

An embodimentl of this invention is illustrated by way of example in theaccompany# ing drawings in which v b Figure l is a front-or a sideelevation'of Fig. 2 is a plan thereof. Fig. 3 is an end elevationthereofshowing certain parts in section. Fig.. 4 is a vertical cross section onthe line A-B of Fig. 2.v Fig.` 5 Ais a view similar to Figl but showingthe apparatus in a dierent operative position.

sponding to Fig. v

As shown in the example the improved micrometer comprises a framing amounted Fig, 6 is a plan correon a base al and having two fixed poppetsb c. The poppet c' carries a micrometric screw c ofknown'construction.The poppet Z) carries'a fixed contact member flocated in the axis of themicrometric screw e opposite to lthe contact member g of the said screw.On the screwy e there is mounted so as to be freely movable thereonayoke It carrying a toothed sector t' gearingwith another sector awhichis pivoted on a fixed support Z so that it can oscillate in a plane I'at right angles to the plane of oscillation of the sector i m is anindicating hand fixedto the sector Z2 its endis 'bent at right angles toform a polnterfn which is adapted to move over an arc o graduated on themillimetric system.

The yoke 71, maybe `fixed to the micrometric screw@ by means-0f a setscrew p so as to .cause it to vmove positively with the .said screw e.;`When the setyscrew is loosl ened, the yoke 'it is independentof themicrometricscrew e and thelatter can then o work freely. `VVhen howeverthe set y'screw 7') is tightened the yoke 71. willbe carriedr l along bythe micrometricscrew when 'the' latter' is rotated and the indicatinghand m- 1 will then be moved over'the graduated arc 0l.-

The yoke It is combined with an actuating These ter of gravity of eachof the levers r s is fsituated `betweenits"pivot and its beak, so thatVthese levers will have a constant ten'- dency to assume' theposition'shown in Figs.` 3 l and 2 where'the lever o" rests with its arm`terniinatingin the'beak172 upon the bracket Z;

'u is an arm pivoted at a; to the poppet c;

' its free end rests upon the lever 8. If pressure be applied toone'of'the knobs 'w the i levers* 9iand k s y.willgos'cillate about ntheir pivotal axisy aind the-r 'beak s2, cooperating fwith the arm uwill Vengage theyo'ke zfand cause it to rock von the micrometric screw euntil a stopm lon the yoke L shall haveencountered the vbeak r2 of thelever o. Inthis In the example shown the micrometric screw e fallows ofmeasuring in the "usual way `toone-hundredthof a millimeter.' `If y nowthe set screw' p be tightened itlwillbe :easy to nOte on' the arc oone-thousandth of `I.atentedSept.1,1914. l

erating the set screw p. In order to render,

the actuation more sensitive, the combination of the yoke L, the sector70 and the micrometric screw (when the latter is iiXedV to the yoke 7i)is subjected to the action of a counter weight 1 straddling the free endof a lever 2 pivoted at 3 to the base' al. The

lever 2 is connected to the sector by means of a rod 4 so that thecounter weight 1 will have a constanttendency to vcause the yoke z tomove in the direction of the arrow 5- shown in Fig. 3. The action of thecounter weight 1 uponl the yoke 7L vis approximately neutralized by theopposing action of a cylinder 6 of.y determined weight, which is pivotedin a recess provided in the base al. One of the journals of the cylinderG is eX- tended outward and ends in an `Operating knob 7. To this end ofthe journalV of the cylinder 6 there is attached a cord 8 which isattached at its other end to the set screw p of the yoke 71,.

Owing to the inertia of the cylinder 6 and to the possibility ofadjusting` the position cf the counter weight 1 on the lever 2` the yoke72, may be balanced in such a manner that its actuationv will beextremely sensitive. In this case the actuation of the yoke la iseffected by rotating the cylinder 6 by means of the knob 7 l c 10 is alever which is pivoted at g and carries a knife edged part 11 locatedopposite a disk 12 keyed on a sleeve 13 of the micrometric screw. Thisdisk is provided at its periphery with fifty notches corresponding tothe fifty divisions ofthe sleeve 13 giving hundredths of a millimeter.After having set the micrometric screw, the lever 10 is moved toward thedisk 12 so as to allow the knife edged member 11 `to enter one of thenotches of the disk. This allows of blocking` the micrometric screwwhile the operator proceeds to` iiX the .yoke i.

The improved micrometer may be used in the following manner :-If it isdesired to determine the diameter of the axle of a wheel of a clockmovement, the said axle is placed between the contact members 7, g; theset` screw o having been iii-st loosened.

The result is immediately given to one-k hundredth of a millimeter bythe microinetricscrew. If however it is .desired to take a more exactmeasurement, that is while the article to be measured is engaged betweenthe contact members, the inicrometric screw is first blocked or lockedby means of suitable for use when it is desired to verify a large seriesof parts as regards one or more dimensions. As a certain variation ortolerance of a few hundredths of a millimeter is generally allowed itwill be easy to appreciate from the position of the hand m thedifference between .the actual `measured dimensionsof an article to bemeasured and the prescribed dimensions.

j What I claim. is:

1. Ina screw micrometer, the combination with the micrometric screw, ofa member normally uncoupled vfrom the micrometric screw, a graduatedarc, an indicating hand movable over said arc by said member,

. means for .coupling said member to the micrometric screwwhen it isdesired that it shall be moved by the inicrometric screw, and means forsetting said indicating hand to Lany desired point of its course whensaid member is uncoupled from the micrometric screw.

2. In a screw micrometer, the combination with the micrometric screw, fa yoke `normally uncoupled from the micrometric screw, a graduated arc,an indicating hand movable overvsaid arc by said yoke, means forcoupling said yoke to the micrometric screw when it is desired that itshall be moved by the micrometric screw, and means comprising two leversand an arm coperating therewith for moving said yoke when said yoke is-uncoupled from the micrometric :screw for setting said indicating handto any desired ypoint of itsl course, and for keeping it stationary atsaid point during the coupling of said yoke to the microinetric screw.

3. In a screw micrometer, the combination with the micrometric screw,kof a member normally uncoupled therefrom, a gradu- -ated arc graduatedto fractions of the indications of the micrometric screw, an indicatinghand movable over said arc yby said member, means for coupling saidmember to the micrometricscrew when it is desired that it shall be movedby the micrometric screw, means for moving said indicating hand to anydesired point of its course jwhen the said member is uncoupled :from themicrometric screw, means for Lkeeping said indicating hand at said pointdui-ing the coupling of said member to the In testimony whereof I havesignediny inioroinetric screw, and multiplying connections between themicrometrie screw and. two subscribing witnesses.

said indicating hand whereby the motion CAMILLE JORIOT.

of the latter is caused to` indicate submulti- Witnesses: ples of theindications of the micrometrie HENRI METZNER,.

- v LOUIS H. MUNIER.

Copies of this patent may be obtained for've cents each, by' addressingthe Commissioner of Patents, Washington, D. G."

name to this specificationl in the presence of

